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@PHDTHESIS{Neis:840320,
      author       = {Neis, Patrick},
      title        = {{W}ater vapour in the {UTLS} –{C}limatologies and
                      {T}ransport},
      volume       = {394},
      school       = {Universität Mainz},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2017-07862},
      isbn         = {978-3-95806-269-6},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {x, 124 S.},
      year         = {2017},
      note         = {Universität Mainz, Diss., 2017},
      abstract     = {The knowledge about the water vapour distribution in the
                      upper troposphere and lower stratosphere is essentialfor
                      understanding the cloud formation processes and the
                      Earth’s radiation budget. Since 1994, theEuropean
                      infrastructure MOZAIC (since 2011 IAGOS) measures water
                      vapour, temperature as well as differentessential climate
                      variables, such as ozone and carbon monoxide (since 2001),
                      aboard commercial passenger aircraft. Before analysing this
                      more than two-decades comprehensive data set, the MOZAIC
                      capacitive hygrometer is evaluated in a blind
                      intercomparison against high precision water vapour
                      instruments with the resulting sensors uncertainty of $5\%$
                      relative humidity. To assure the data quality and the
                      consistency of the data set, the new and improved IAGOS
                      capacitive hygrometer is also evaluated against high
                      precision water vapour instruments in a subsequent blind
                      intecomparison. The water vapour data set is analysed with
                      high vertical resolution around the thermal tropopause in
                      the North Atlantic flight corridor and shows an increased
                      probability of ice supersaturation with decreasing distance
                      to the tropopause. This probability is especially pronounced
                      in winter, but partially underestimated in its quantity in
                      global weather models. Further analyses show a
                      quasi-isentropic troposphere-to-stratosphere transport of
                      water vapour near 50$^{\circ}$N and below 350 K of potential
                      temperature in summer. Within a final case study the future
                      potential of the IAGOS data set is demonstrated by using the
                      new cloud index besides the simultaneous water vapour
                      measurements to separate the water vapour distributions into
                      clear sky and in-ice cloud data. With this separation,
                      investigations show different amounts of cloud occurrence
                      and cloud properties for different global regions.},
      cin          = {IEK-8},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {899 - ohne Topic (POF3-899) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-899 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2017121412},
      url          = {https://juser.fz-juelich.de/record/840320},
}